Ammo, or ammunition, is a resource that contributes to a player's weapon ammunition supply. Ammunition can be found in the form of Ammo crate pickups, dropped weapons, or destroyed building parts. Ammo is universal, meaning that ammo in the form of any dropped weapon can be used in any other weapon; ammo acquired from a dropped Flamethrower will still be usable as Sniper Rifle ammo, and can also be used to fill the Cloak charge for the Spy's Invis Watch and Dead Ringer. Additionally, the amount of ammo in a pick-up is applied to all weapons equipped, not just the one currently held. Reloading cannot be performed without having reserve ammunition. Should the player expend all ammunition with a weapon, it will be automatically switched with another and will be unavailable for use until more ammo is obtained.

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Sources

Ammo pickups come in three different sizes. Each one refills a different percentage of their player's total ammo capacity (The ammunition that can be stored in a weapon's magazine is not factored into this percentage), as well as the Engineer's metal, and the Spy's Invisibility Watches (excluding the Cloak and Dagger). There are also several other sources of ammo that can be found:

Ammo boxes

All Ammo crates have a 10 second respawn time.

Small Ammo Pickup: Refills a fifth (20%) of each weapon's ammo capacity.